Mentioned this to RussianGuy already but just making a note here too:

It seems like you can just pluck feathers forever, even when the bird's wear & tear hits 100%. It also never seems to die, goes down to half a heart but then just keeps giving feathers.

Example video: https://streamable.com/343ioz

Also might be giving too many feathers until wear & tear reaches 100% in general?

Cheers,
SC